Wt is a C++ library for developing Web
applications with an API that is widget-centric
and inspired by existing C++ graphical user
interface APIs. To the developer, it offers
abstraction of Web-specific implementation details, increasing the accessibility and portability. Under the hood, the library uses the latest techniques (HTML5, Ajax, WebSockets) to handle user events and update the Web page.

noVNC is a VNC client implemented using HTML5 technologies, specifically Canvas and WebSockets. It supports "wss://" encryption (SSL/TLS). For browsers that do not have native WebSockets support, the project includes web-socket-js, a WebSockets emulator using Adobe Flash. In addition, as3crypto has been added to web-socket-js to implement WebSocket SSL/TLS encryption, i.e. the "wss://" URI scheme.

AsterClick is a system for developing with Asterisk AMI and HTML5 WebSockets. It is composed of two parts: a server-side middleware and a client-side JavaScript class. The server-side middleware mediates between Asterisk AMI and multiple HTML5 browsers connected via WebSockets. The JavaScript class manages the WebSockets connection and provides methods like addEventListener() and removeEventListener() that take AMI events as parameters. AsterClick does away with browsers polling servers by exploiting the persistent nature of HTML5 WebSocket connections. The communications protocol between client and server is based on XML. Commands can be sent via the JavaScript class using XML strings, XML objects, or JSON objects. A client can connect to multiple Asterisk servers at the same time. The server-side component of AsterClick has hooks for both custom AsterClick commands and server side plugins and related events that all share the same XML stream.

GNU WebSocket4J is a WebSocket protocol implementation in Java. It allows you to build Web applications that interact with applications running in a JVM. GNU WebSocket4J implements both the server and client side of the protocol, so it can be used to build both WebSocket servers and clients.

JSModem provides a virtual modem device for the JSLinux platform. It is a result of studying a project conducted on PC emulator that was implemented in JS by Fabrice Bellard (see http://bellard.org/jslinux). It allows Internet connectivity by tunneling into the server side.

RealOpInsight is an advanced business service monitoring dashboard toolkit for Nagios, Zabbix, Zenoss, Icinga, and other common monitoring systems including GroundWork, Centreon, Shinken, and op5 Monitor. It provides features for effective monitoring in demanding operations such as clouds, network operations centers, and large data centers.

Duda I/O is an event-driven based web services and application framework for Linux. The stack provides a friendly C API to build solutions based on HTTP or Websockets. It support third-party components such as JSON, Redis, SQLite, and others.

RunSlides combines an HTTP server and JavaScript helper functions to enable interactive HTML5 presentations. Source code snippets can be edited and run within the browser interface, and the program output is shown. The code snippets may be embedded in code templates before execution to avoid boilerplate code in the slides.